Resulted in a massacre of 32 Jews. The following year, Emperor Frederick II of Hohenstaufen established an investigation at Hagenau to confirm or disprove the charges. After hearing various experts, including Jewish converts to Christianity, he declared that since Jews are prohibited from eating animal blood, they would surely be banned from using human blood. He forbade anyone to accuse Jews of ritual murder", Privilegium e sententia in favorem iudaeorum . Pope Innocent IV also condemned the accusations as unfounded.